docs: def exec_script(scriptfilename, *args):
      """
      Executes a Python script in an externally spawned interpreter, and
      returns anything that was emitted in the standard output as a
      single string.
  
      To prevent missuse, the script passed to hookutils.exec-script
      must be located in the `hooks` directory.
      """
  
      if scriptfilename != os.path.basename(scriptfilename):
          raise SystemError("To prevent missuse, the script passed to "
                            "hookutils.exec-script must be located in "
                            "the `hooks` directory.")
  
      cmd = [os.path.join(os.path.dirname(__file__), scriptfilename)]
      cmd.extend(args)
      return __exec_python_cmd(cmd)